Telephone-switch system



2 Sheena-Sheetv 2.

(No Model.)

o. o. GOULD, TELBPHDNE SWITCH SYSTEM.

Patented Ma.r.,3, 1891.

me mms Penas ce.. mmlumm, msummu, n. c.

UNITED STATES PATENT OFTTCE.

CLAUDE O. GOULD, OF BATAVIA, ASSIGNOR TO THE EASTERN ELECTRICAL MANUFACTURING COMPANY,

TELEPHONE-SWITCH SYSTEM.

OF VHEATFIELD, NEV YORK.

Application filed October 10,5 1887. Serial No. 251,885. (No model.) i

To all whom t may concern:

Be it known that I, CLAUDE C. GOULD, of Batavia, in the county of Genesee and State of New York, have invented a new and useful Improvement in lTelephone-Switch Sys tems, of which the following is a specification. Y

This invention relates to an improvement in that class of switch-board systems in which 1o each subscribers line is provided in the central office with a movable terminal, which is automatically moved out of its normal position, so. as to break the connection with the ground, upon sending acurrent through the The object of my invention is to provide a simple switch system of this kind whereby the connections between the subscribers can be effected expeditiously and with few movezo ments.

My invention consists-to these ends of the improvements which will be hereinafter f ully described, and pointed out in the claims.

In the accompanying drawings, consisting of two sheets, Figure l is a vertical sectional elevation of my improved" switch-board system. Fig. 2 is a horizontal section in line so cc, Fig. l. Fig. 3 is a vertical section of the movable switch-bar in line y y, Fig. l. Fig.

3o 4 is a sectional elevation in line .e z, Fig. l.

Fig. 5 is a diagram of two switch-boards arranged side by side, showing the manner of connecting subscribers on different boards.

. Like letters of reference refer to like parts 3 5 in the several ligures.

A represents the table portion, and A the upright portion, of the switch-board, which is provided with sockets c, in which are arranged the subscribers plugs B. Each socket@ is 4o provided with a spring a', which bears against a cont-act-point b, arranged near the inner end of the `socket when the plug B is seated in said socket. Above each subscribers'socket o, is arranged a local outsocket c, which is connec-ted with the subscribers line D by a leg or wire c.

E represents the annunciator, and E the base thereof, which is secured to the upright portion A of the switch-board. The annun- 5o ciator E is connected with the subscribers instrument D by the wire D and with a com tact-point or spring e by awire e.

e2 is a contact-spring bearing against the spring c and connectedwith the cord of the plug B by a wire The contact-springs e e`2 55 are secured to a cross-piece e, arranged in rear of the upright portion A.

fis the apron of the annunciator E, which is pivoted at its 'lower end to thebase Eand held in an elevated position by a hook or nose 6o f', formed at the outer end of the vibrating` armature f2 in a well-known manner. The apron f is provided below its pivot with a downwardly-projecting lip or tail-piece f3, which engages against the outer end of a horizontal locking-bolt G and moves the same inwardly when the apron f is released by the armature f 2. The locking-bolt Gis arranged in lugs g, formed on the under side of the base E', and is moved outwardly by a spiral 7o spring g', interposed between the inner end of the base E and a collar secured to the bolt G.

g2 is a loop or link formed at the inner end of the sliding bolt G and projecting through an opening g3 in the upright portion A. The outward movement of the bolt is limited by the outer end of the link striking the lug e of the base E, as represented in Fig. 2.

H represents the vertically-movable switch- 8o bar arranged on the rear side of the switchboard and moving in metallic brackets 7L h', secured to the portion A. The switch-bar H is provided near its upper end with a hook or nose 71,2,which engages with the rear cross-bar of the link g2 and holds the switch-bar in an elevated position.

h3 represents a spiral spring secured with one end to the switch-bar H and with its opposite end to an arm h4, formed on the upper 9o bracket h, and whereby the switch-bar is drawn downwardly when released by the sliding bolt G. The arm h'l is provided at its upper end with a guide q.roller h5, which bears againstthe upper rear side of the switch-bar 9 5 1 and assists in guiding the latter in'its movements. lVhenthe apron f drops bythe vibration of the armature f2, its lip f3 strikes the outer inclined end of the locking-bolt G and causes the bolt to move inwardly, thereby disroo engaging the link g2 from t-he hook 7b2 of the switch-bar and allowing the latter to descend. Upon raising the switch-bar H its hook 71,2 engages in the link g2, and the spring g draws the link outwardly and holds the same in engagement with the hook h2.

't' is a cam or curved extension formed at the upper end of the switch-bar H above the hook 712, and which strikes the rear end of the sliding bolt G when the switch -bar descends and drives the sliding bolt outwardly against the lip f3 with suicient force to raise the apron f and cause the same to engage with the hook f of the armature f2.

Each switch-bar H is provided with a but ton or knob j, which is visible to the operator, and whereby the operator can determine which switch-bar has fallen. The button j is secured to the lower end ot' the switch-bar H by a shank j', which projects through a vertical slot j? in the board A.

7.: is a wire connecting the upper metallic bracket 7L with the contact-point b, and 7c is a wire connecting the lower metallic bracket 7L with the ground. The two brackets 7L 7L are connected by a metallic spring 7a2, secured to the switch-bar H and bearing against said brackets when the switch-bar is in an elevated position. In this position of the switch -bar the circuit is closed and the subscriber is connected with the central otlice, the current passing from the subscribers line I) through the annunciator E, thence through the wire c to the contact-springs c e2, thence through the wire eS to the plug B, from the latter through the spring a', contact-'point b, wire 7c, upper bracket 7L, spring 7a2, lower bracket 71,', and finally to the ground through the wire 7c. lVhen the switch-bar II is in a depressed position, the spring 7a2 is disconnected from the brackets 7L 7L and the circuit is broken.

L is the operators listening telephone, which is connected with two contact-springs 7 7' by wires 72 Z3. The contact-springs Z 7 are secured to the cross-bar e4 and are arranged in rear of the contact-springs c e2 and in line therewith, as shown in Fig. 4.

M represents a switch-lever arranged below the switch-bar H and the contact-springs e e2 Z Z', and pivoted with its rear end to a cross-piece m and projecting with its front end through the slotj?.

The switch-lever M is constructed of suitable nonconductive material and provided on opposite sides with metallic contact-surfaces m m2, which are separated from each other, as clearly shown in Figs. l and 4:. Upon raising the leverM the contact-surfaces on m2 engage between the springs e e2 and ZZ and separate the same. In this position of the lever the contact-piece m connects the springs e and Z, while the contact-piece m2 connects the springs e2 and Z', thereby causing the current to pass through the wires Z2 Z3 and looping the operators telephone into the circuit. The free ends of the contact-springs e e2 and Z 7 are bent outwardly, and the metallic contact-surfaces of the lever H are V- sh aped to facilitate the entrance of the switchlever between the contact-springs. Then released7 the switch-lever is returned to its depressed position by a spiral spring m3. The switch-lever M is arranged directly below the switch-bar H, so that the latter rests upon the switch-lever when in its lowest position and is raised by the upward` movement of the switch-lever.

N represents the generator, which is connected with the ground by a wire n and with a contact-point n', arranged near the inner end of the outsocket c, by a wire n2.

0 is a flat contact-spring arranged within the outsocket c and connected with the wire c. rIhe spring o is so arranged that its free inner end will not be raised sufiiciently to come in contact with the contact-point n in the normal position of a plug placed in the socket c, but will merely bear against the plug. Then it is desired to connect the gen'- erator with the main line, the handle ot the plug seated in the outsocket c is depressed, so as to raise -the inner end of the plug and press the inner end of the spring o against the contact-point n. The socket c is made somewhat larger than the plug to permit of this movement of the plug.

P represents a metallic socket secured in the upright portion A of the switch-board and provided with a contact-spring P,which is connected bya wire p with a contact-spring p on the rear side of the switch-bar I-I of the same subscribers annunciator, located on a different switch-board7 as indicated in Figs. 1 and 5.

P2 is a wire which connects the generator with a contact-point P3, arranged near the inner end of the outsocket I.

p2 p3 represent two contactpoints secured to a cross-bar p4 above and below the contactspring p.. The contact-point pais connected with the main line D by a wire p5, and the contact-point p3 with the line c by a wire 19.

W'hen the switch-bar His in an elevated position, the spring p bears against the upper contact-point p2, and when the bar is in a depressed position the spring p' bears against the lower contact-point p3.

Each switch-board is provided with as many local outsockets c as there are subscribers arranged on said switch-board and with as many outsockets P as there are subscribers connected with the other switch boards or sections in the same exchange.

In making a connection between two subscribers located upon the same board or section, the operation is as follows: Then the subscriber calls the central otlice, the vibration of the armature f2 releases the apron f, which causes the sliding bolt G to release the switch-bar II and allow the same to descend, thereby disconnecting the contact-spring 7a2 from the brackets 7L 7L and breaking the circuit. The calling subscriber can now no longer ring his bell, and from this fact he IOO IIO

IIS

iciently to permit their hooks 7L2 to engage' in the loops g2 of thelocking-bolts, and hence the switch-bars again descend, thereby replacing the aprons without interfering with the connected subscribers. When the subscribers ring 01T, the aprons of both subscribers drop, and this notities the operators thatthe subscribers have finished. The switch ba'rs of both subscribers are now again raised, so as to replace the fallen aprons and restore the lines to their original condition ready for another call.

I claim as my inventionl. The'combination, with the annunciator and its apron, of a locking-bolt actuated by the falling of the apron, and a movable switch-bar engaging with said locking-bolt and adapted to replace the fallen apron when disengaged from said locking-bolt, substantially as set forth.

2. The combination, with the annunciator and its apron, of a locking-bolt actuated by the falling of said apron, and a movable switch-bar engaging with said locking-bolt and provided with a cam which strikes the locking -loolt when the switch-bar descends and replaces the fallen apron, substantially as set forth.

3. The combination, with the apronfand the locking-bolt G, of a movable switch-bar l-I, provided with a hook or nose engaging with said locking-bolt, and with a cam c', arranged above said hook or nose, which moves the locking-bolt forwardly when the switchbar descends, substantially asset forth.

4. The combination, with the apronfand the locking-bolt G, of a movable switch-bar H. provided with a hook or nose engaging with said locking-bolt, a cam ,arranged above said hook or nose, which moves the lockingbolt forwardly when the switch-bar descends, and an incline q, formed at the upper end of the switch-bar, and whereby the locking-bolt is moved forwardly and the apron is replaced when the switch-bar is raised, substantially .as set forth.

5. The combination, with the locking-bolt G and the movable switch-bar H, of a switchlever M,-arranged below the switch-bar and adapted to raise the latter for engaging the locking-bolt with said switch-bar, while at the same time looping` in the operators list- Lening-telephone, substantially as set forth.

6. The combination, with the switch-bar H, of the contact-springs c e2 l l', listening-telephone J, and a switch-lever M, whereby the listening-telephone is looped into the circuit and the switch-bar is elevated upon raising the lever M, substantially as set forth.

7. The combination,with the contact-points 192193, connected with the main line, of a switchbar H, provided with a contact-pointp, adapted to engage alternately with the contactpoints p2 p3, and an outsocket P, connected with the contact-point p', substantially as-set forth.

8. The combination, with the locking-bolt G and the switch-bar H, of the contact-points p2 p3, connected with the main line, a contactspring p', attached to the switch-bar and adapted to engage with the contact-point p2 when the switch-bar is in a normal position and with the contact-point@3 when the switchbar is in an abnormal position,substantially as set forth.

9. rlhe combination, with two or more scctions or tables, of a switch-lever H and contact-pointspp2p3, arranged upon one section, and an outsocket P, arranged in some other section and connected with the contact-point p', substantially as set forth.

fitness my hand this 20th day of September, 1887.

oLADE c. GoULo.

Vitnesses:

J No. J. BoNNnR, FRED. O. GEYER.

knows that his call has been received at the central ollice. The subscribers call is made known to the operator by the descent of the signal j. The operator now raises the switchlever M, thereby raising the switch-bar ll and rertoring the circuit and at the same time looping in his listening-telephone L. This movement again engages the bar H with the sliding bolt G. When the operator has ascertained with whom the calling subscriber wishes to be connected, he allows the switchlevcr to descend and places the calling subscribers plug B into the outsocket c of the called subscriber, whereby the two subscribers are connected. By thus removing the plug l from the socket a the calling subscribers ground is broken at the central oice by the spring a moving away from the contactpoint l). The two subscribers are now connected by the current passing from the calling subscribers line D to and through the annunciator E, wire c', contact-springs c c2, wire ci", plug B, contact-spring o of the socket c, and wire c to the called subscribers line D. Then the connection between the two subscribers has been effected, the operator depresses the handle of the calling subscribers plug seated in the called subscribers outsocket, thereby pressing the contact-spring o against the contactpoint n and connecting the generator N and ringing the bells of both subscribers simultaneously, thus notifying them that they have been connected. lle then allows the inner end of the plug to descend, so as to disconnect the spring o from the contaet-poiutyn and cut out the generator.

Then the generator is connected on the circuit, the plug D is held in contact with the generator contact-point long enough to call up both subscribers. As this interval is longer than that required for the switch-bar to descend, the armature of the calling subscriber is caused to vibrate after the switchbar has fallen and the apron has been operated by the sliding' bolt. This continued vibration of the armature prevents the apron from engaging with the hook of the armature, and the latter consequently drops again, whereby the locking-bolt is moved inwardly, as above described, and held in this position by the lip f3 of the apron bearing against the front inclined end of the bolt. This connection with the generator also causes the current to overow the line D of the called subscriber and vibrate the armature of the called subscribers annunciator, thereby releasing the switch-bar H and breaking his ground at the central oiiice. The descending movement of the called subscribers switch-bar ll causes the locking-bolt G to again replace the apron f, as before described.

In order to enable the operator to determine when the subscribers have rung oli, it is necessary t-o again raise the switch-bar ot' the calling subscriber and replace his fallen lline is engaged.

apron. For this purpose the switch-bar is provided above the cam with an incline (j, which engages in its ugward movement against the rear end ot the locking-bolt- G, thereby moving the latter forwardly and again elevating the apron.

Then the subscribers ring off, the callingsubscribcrs armature f2 is again vibrated, the apron drops, and the switch-bar, with its signal, descends, thus notifying theoperator that the subscribers have nished. The operator now raises the switch-bars of both subscribers, whereby the lines are restored to theiroriginal condition ready foranother call.

It a subscriber is wanted whose terminal is located on some othersection or table,the operator inserts the plug B ot` the calling line into the socket I of the called line. The subscribers are now connected through the calling subscribefsline D, wire c', and plugv B, as above described, contact-spring P', wire p, contact-spring p of the called subscribers switch-bar H, contact-point p2, wire p5, and called subscribers wire D. The operator now loops in his listening-telephone L by raising the lever M and ascertains whether the called It the operator linds that the called line is engaged, he withdraws the plug B without interference with the called line. It the operator finds the called line to be disengaged, he depresses the plug 2 in the outsoclet l), so as to connect the contactspring P with the generator, thereby calling bothlinessimultaneously. rlheogeratornow allows the rear end of the plug to descend, so as to disengage the generator from the line. By connecting' the main line with the generator the switch-bars l-I of both subscribers are allowed to descend, thereby disengaging the contact-spring p from the upper contactpoint p2 and connecting the same with the lower contactpoint p. The calling subscriber is now connected with the called subscriber by the plug B, as above described, outsocket P, contact-spring P', wire 29, contactspring p of called subscribers switch-bar H, lower contact-point p3, wire p, wire c', called subscribersannunciatorE,andwireD. This connection with the generator causes the armatures f2 of both annunciators to vibrate longer than the 'interval required by the switch-bar to descend, as hereinbefore described, thereby allowing the aprons to drop and remain in this position. This position of the apron on the section or table on which the called subscriber is arranged notities the operator on said section that the subscriber has been called by an operator on a diercnt section. The operators in charge of the tables upon which the two subscribers are located now give the hand-levers M a short and quick upward movement, so as to cause thc cams q at the upper end of the switch-bars to move the locking-bolts G- outwardly and replace the aprons. This short movement of the levers does not, however, raise the switch-bars suf- IOO I'IO 

